1 irobot xlife extended life battery. Robot run times remain the same between recharges | delivers up to 2x the battery cycle lifetime. Use roomba as directed for longest battery life | compatible with roomba 500/600/700/800 series robots, authentic part manufactured by irobot | note: please refer to the user manual (page 2 and 6 ) for optimum battery performance. Battery lifetime varies with home environment and usage | the irobot xlife extended life battery delivers up to 2x the battery cycle lifetime, as compared to the irobot advanced power system battery. Compatible with roomba 500, 600, 700, and 800 series and scooba 450 robots. Irobot can only guarantee the quality and performance of authentic parts. Accessories and replacement parts manufactured by 3rd parties may have a negative impact on product performance or cause damage to your robot. Use of 3rd party replacement parts could void your robot's warranty.